Shiva Purana
शुभं लब्ध्वा न हृष्येत कुप्येल्लब्ध्वाऽशुभं न हि ॥ द्वंद्वेषु समता यस्य ज्ञानवानुच्यते हि सः ॥ ३१ ॥
If a person is not elated on acquiring something good and is not annoyed on acquiring something bad and if he has equanimity, he is said to be perfectly wise.
english translation
zubhaM labdhvA na hRSyeta kupyellabdhvA'zubhaM na hi ॥ dvaMdveSu samatA yasya jJAnavAnucyate hi saH ॥ 31 ॥
hk transliteration by Sanscript